1. Select photos

2. Always the right tool

Select "TOOLS" and then "Convert Photos" to open the conversion wizard. Conversion not only means changing the file format but also file dimensions.

3. Review selection

You can review your selection and make necessary changes like removing or adding photos here. Click "Next" to proceed.

4. Select command

You can combine several commands to create an individual image processor here. For this example, please select "Resize" and click the arrow button to add it to the list of chosen commands. Then, click "Custom Options".

5. Select image size

This dialog allows you to select the new image size either in pixels or centimeters. Make sure to enable "Lock aspect ratio" to preserve the aspect ratios of your photos. Please select "Centimeters" and input the new width and height for your photos. A4 landscape would be 29.7 by 21.0 centimeters. Click "OK" to confirm your settings.